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[SPARK-7276] [DATAFRAME] speed up DataFrame.select by collapsing Project
Author: Wenchen Fan <cloud0fan@outlook.com> Closes #5831 from cloud-fan/7276 and squashes the following commits: ee4a1e1 [Wenchen Fan] fix rebase mistake a3b565d [Wenchen Fan] refactor 99deb5d [Wenchen Fan] add test f1f67ad [Wenchen Fan] fix 7276
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala 24 additions, 16 deletions...a/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/FilterPushdownSuite.scala 2 additions, 1 deletion...he/spark/sql/catalyst/optimizer/FilterPushdownSuite.scala
- sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala 3 additions, 1 deletionsql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
- sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala 12 additions, 0 deletions.../src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
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